Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff0240a304ba58d…

MALICIOUS

PDF

94.4 KB Created: 2021-08-05 18:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 769b416856c94c5e05e63a15cecebc74 SHA-1: feeef8744f73942cf2112f1addeb8c4839ceb6fd SHA-256: bff0240a304ba58d7c0a5a02acb4d00f057bf537492881267c4f2d6c7be0b914
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external URLs, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/sk2ic1bd7ueccteafnudofkcvq/wizuvabevawuxipomatexefu.pdf In PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dcf13a6390ac58bcf916f6ab8a660a62/gomegimi.pdfIn PDF document text
    • http://proxima-design.cz/files/file/guxakotuwulinutaba.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/4ihu9iim6jtd4ne5m6cicbfa00/59361084538.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/jeribu.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/tasukinuzapuxiraka.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6c3tf6r82r2goraqslgcmggo41/87784184478.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/57335033424.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609691ef3bafe---futobomixopilajosolibuba.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fesudojizazujo.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb1232bb74---99540855852.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/u6if73am6s3elitmbvpiel68lb/20062804499.pdfIn PDF document text
    • https://coil.hk/upload/files/suxufodoruzalojev.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/613e362a75d33f297957cc0683be4ac6/nasel.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/24574059902.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/nimepakoveninoparinekazal.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daa42bed3b---19476750244.pdfIn PDF document text
    • http://mrsjamesirvine.com/clients/82887/File/vatepasanaxotera.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078b5e3dcf1c---waxikewifaxidemoke.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086af221541c---jopagojurebalurogerefifez.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/5336904000.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fd7732122cb---todika.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3158a18a3e---guwavejonijize.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b064f52b---39181379620.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/30915620980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=generalites+sur+les+fonctions+numeriques+exercices+corriges+pdf+1bacPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000145df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x145DF 20948 bytes
SHA-256: db1be441a8cdf0d7ec13835676cf802253992dc5f7a9fcc0479d7b8205f1e8b0
font_00_sfnt_off0000e830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 11540 bytes
SHA-256: 7376fb9d0a48bdc7b8a656339a881a0db56e3e59ec731f87a86072cce3de2011
font_01_sfnt_off000102e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E0 16920 bytes
SHA-256: 99dfccb4725877eff4553307139ec981a9c34594c1d9f49873a98ed6d3acc1f5
font_02_sfnt_off00012dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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